From our Supp Regs, Apendix A:
ELECTRIC CONVERSION (ECC):
(a) Any car which has been converted from internal combustion to electric motor drive,
which otherwise meets the preparation rules of STREET PREPARED category.
Hybrid cars are permitted, but the internal combustion engine must be inoperative
during competition.
(b) Regenerative braking is permitted.
(c) Number of batteries, or type is unrestricted. Combinations of power sources
(batteries, solar cells, etc.) are unrestricted. Charging systems must be in place
and operational.
(d) Charging of batteries between runs is not permitted.
(e) Location of batteries must be such that escaping gasses will be adequately vented
outside of the car.
(f) Batteries may be inside of the passenger compartment, but must be mounted,
secured and restrained to the extent that should an 'incident' occur, there would be
little or no likelihood of a battery striking the driver.
(g) A Master Kill switch, labeled MASTER KILL, which disconnects all battery power
from the motor(s) and controller(s) shall be installed outside of the car, driver's
side, at the base of the windshield on closed cars, or adjacent to the roll bar in an
open car.
What's interesting is when Craig proposed this, he was looking at converting a Datsun.